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Article: Continuous compressive stress relaxation of elastomers used in engine sealing applications.
- Article from:
- Rubber World
- Article date:
- February 1, 2004
- Author:
CopyrightCOPYRIGHT 2004 Lippincott & Peto, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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The use of compressive stress relaxation (CSR) measurements for screening elastomers in sealing and gasketing type parts in the automobile industry has been slowly gaining acceptance. Stress relaxation is a phenomenon which comes about upon application of a constant strain (tensile or compression modes) to a rubber sample. The force that is necessary to maintain that applied strain is not constant, but decreases with time (ref. 1). In compression, there is a decrease in sealing contact force over time at a constant strain (ref. 2). The processes that are taking placing in the rubber matrix are both physical and chemical in nature. There is an immediate physical relaxation ...